Step 3: The code

Step 4: Results!

There is no LED, sound or LCD for debug or visualization, just through the serial line. The video demonstrate how to use the software. I didn't post ...

On this instructable I will try to show how to interface a RFID sensor with the Arduino. I am using the RFID sensor from seeedstudio the serial version of it. There are a few parts you will gonna need. I also bought some RFID keys.

It doesn't read anything, where do you get the tag ID number? on the cards there is a number printed on them, one is '0000946210 014,28706' and the other is '0001361049 020,50329' so are these supposed to be the id number?

Hi, thanks for the reply. I had used a 125Khz card instead. So I tried the code of brenryan since I just need a simple program that displays the card's id(also modified 1 line of the code "tag=tag.substring(1,13);" replaced 13 with 19 since my card has 18 digit code. Anyway, now I'm facing a different problem, do you have any idea why the output looks like this?

Hello! I'm quite confuse on my connection to arduino uno to rfid rc522 don't know where should I connect the pins from rfid rc 522 to arduino uno.. Pls do show some pics for their connections or guides... Need help also for a sample module to test my rfid rc522 if its working or not using my arduino uno... I really appreciate your great help..

can you help im having issues compiling code on the link it one. Not sure if I have the right library.

sketch_jan28a.ino: In function 'void loop()':sketch_jan28a.ino:30:40: error: 'add' was not declared in this scopesketch_jan28a.ino:31:45: error: 'del' was not declared in this scopesketch_jan28a.ino:32:37: error: 'verifica' was not declared in this scopeError compiling.

Power UP your ES 125R module, make a program to continues read the serial port at 9600 baud rate, open the serial monitor, approach the rfid tag to the board and see if something has been send through the serial port.

Hi I have arduino Mega ADK, Here is a preview of it, http://arduino.cc/en/uploads/Main/ArduinoADK_R3_Front.jpg can you tell me where to connect the TX of RFID in the arduino board? I,m an extreme beginner so if my question is stupid please bear with me. Just tell me the exact pin number on which to attach from the arduino board's picture! Thanks in advance.

Nice ible. Well done, I learnt much more about this RFID module here than on it's wiki...

I'm just trying to make a simple reader that just spits out the read tags ID number then moves onto a new line. I've taken bits of your code to get started, I don't see why it's not working the same way as it does in yours :/

That code has some of the same unpredictable results I was experiencing sort of a "stacking" phenomenon, If you hold the tag for just the right amount of time it's ok... But that's not going to happen too often.

Wow, that was a fast reply! I just ordered a new RFID reader (one that hopefully works with your solution) and i just like the idea of adding and deleting tags 'on the fly' rather than hardcoding them. Since I'm an Arduino newbee, I have really no idea how to create such a modification. Could you help me out please?